Tight Junctions

A tight junction completely encircles an epithelial cell near its apex and joins it tightly to the neighboring cells, like the plastic harness on a six-pack of soda cans. Proteins in the membranes of two adjacent cells form a zipperlike

Tight junction

Plasma membrane Membrane protein Intercellular space

Tight junction

Plasma membrane Membrane protein Intercellular space

Desmosome

Intermediate filaments

Tight Junction Membrane

Membrane protein

Cell nucleus

Basement membrane

Hemidesmosome

Figure 5.29 Types of Intercellular Junctions.

Which of these junctions allows material to pass from one cell directly into the next?

Desmosome

Intermediate filaments

Membrane protein

Cell nucleus

Basement membrane

Hemidesmosome

Figure 5.29 Types of Intercellular Junctions.

Which of these junctions allows material to pass from one cell directly into the next?

Saladin: Anatomy & I 5. Histology I Text I I © The McGraw-Hill

Physiology: The Unity of Companies, 2003 Form and Function, Third Edition pattern of complementary grooves and ridges. This seals off the intercellular space and makes it difficult for some substances to pass between the cells. In the stomach and intestines, tight junctions prevent digestive juices from seeping between epithelial cells and digesting the underlying connective tissue. They also help to prevent intestinal bacteria from invading the tissues, and they ensure that most digested nutrients pass through the epithelial cells and not between them.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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